Utilizing ablation of solids to characterize a focused soft x-ray laser beam
Utilizing ablation of solids to characterize a focused soft x-ray laser beam
复制标题
利用固体烧蚀来表征聚焦软 X 射线激光束
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
K. Tiedtke
中科院分区：
文献类型：
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作者：
J. Chalupský;L. Juha;J. Kuba;V. Hájková;J. Cihelka;P. Homer;M. Kozlová;T. Mocek;J. Polan;B. Rus;J. Krzywinsky;R. Sobierajski;H. Wabnitz;J. Feldhaus;K. Tiedtke
已经开发出一种先进的时间积分方法，用于软 X 射线脉冲激光束表征。基于聚甲基丙烯酸甲酯 - PMMA 激光诱导烧蚀的技术已用于软 X 射线激光源的光束研究，如 FLASH（汉堡自由电子激光激光器；以前称为 VUV FEL 和/或 TTF2 FEL）和 PALS（布拉格 Asterix 激光系统）中基于等离子体的类 Ne Zn 激光器。对于此处报道的相互作用实验，FLASH 系统提供了 21.7 nm 辐射的超短脉冲 (~10-fs)。 PMMA 烧蚀也是由 PALS 设施中近红外光束泵浦的类氖锌软 X 射线激光器引起的。这种准稳态 (QSS) 软 X 射线激光器提供 21.2 nm 辐射的 100 ps 脉冲，即波长非常接近 FLASH 的波长，但脉冲长约 5,000 倍。在这两种情况下，PMMA 样品均在法向入射条件下通过聚焦光束单次照射进行照射。利用 AFM（原子力显微镜）和 Nomarski 显微镜获得的烧蚀坑的特征用于烧蚀 PMMA 表面的聚焦激光束的轮廓重建和直径测定。
An advanced time integrated method has been developed for soft X-ray pulsed laser beam characterization. A technique based on poly (methyl methacrylate) - PMMA laser induced ablation has been used for beam investigations of soft X-ray laser sources like FLASH (Free-electron LASer in Hamburg; formerly known as VUV FEL and/or TTF2 FEL) and plasma-based Ne-like Zn laser performed at PALS (Prague Asterix Laser System). For the interaction experiments reported here, the FLASH system provided ultra-short pulses (~10-fs) of 21.7-nm radiation. The PMMA ablation was also induced by plasma-based Ne-like Zn soft X-ray laser pumped by NIR beams at the PALS facility. This quasi-steady-state (QSS) soft X-ray laser provides 100-ps pulses of 21.2-nm radiation, i.e. at a wavelength very close to that of FLASH but with about 5,000 times longer pulses. In both cases, the PMMA samples were irradiated by a single shot with a focused beam under normal incidence conditions. Characteristics of ablated craters obtained with AFM (Atomic Force Microscope) and Nomarski microscopes were utilized for profile reconstruction and diameter determination of the focused laser beams ablating the PMMA surface.